MarshallingException when trying to mapping a Class to a document on playframwork

Question

I'm writing a Play 2.3.2 application in Java and I'm using Jongo as driver for MongoDB. After do some changes to my code my application gives me runtime errors. The error is given to the fourth lines of the getUser method. This is my used code:

public static User getUser(String email) {
        Jongo jongo = MongoFactory.getJongo();
        MongoCollection users = jongo.getCollection(USERS_COLLECTION);
        return users.findOne("{email: '"+email +"'}").as(User.class);
}

After adding the Module class to Company, the method as in the lines above was unable to unmarshall the result of find.

public class User {
    //... some fields ...
    private Company company;
    //... constructor using all fieds ...
    //... getters and setters for all fields ...
}

public class Company {
    //... some fields ...
    private List<Module> modules;
    //... constructor using all fieds ...
    //... getters and setters for all fields ...

    public class Module {
        private String name;
        private Date createTime;
        private Date expireTime;
        private Map<String, Object> options;

        //... constructor using all fieds ...
        //... getters and setters for all fields ...
    }

}

And this are the runtime-error :

    play.api.Application$$anon$1: Execution exception[[MarshallingException: Unable to unmarshall result to class bdrim.models.User from content { "_id" : { "$oid" : "53beb050d10e5ba896d8d912"} , "email" : "alberto@zero12.it" , "name" : "Alberto" , "surname" : "Simioni" , "password" : "$2a$10$E4hi2giYm4LnYq5e3TrfheGhsjtydWtl3GR/87.tUIA1Xs8MtY9kS" , "company" : { "name" : "Zero12 s.r.l." , "vat" : "04631710284" , "telephoneNumber" : "0499414411" , "country" : "Italy" , "city" : "Carmignano" , "postalCode" : "35010" , "address" : "Via spessa 25/c" , "modules" : [ { "name" : "mailchimp" , "createTime" : { "$date" : "2014-10-15T12:19:12.416Z"} , "expireTime" : { "$date" : "2015-10-15T12:19:12.416Z"} , "options" : { "listid" : "6d7e5ad5b8" , "apikey" : "9fe7bcf4d2ffff92306cf1de28acc9ea-us9"}}]} , "role" : "Super Administrator" , "idShop" : "Shop2"}]]
        at play.api.Application$class.handleError(Application.scala:296) ~[play_2.11-2.3.2.jar:2.3.2]
        at play.api.DefaultApplication.handleError(Application.scala:402) [play_2.11-2.3.2.jar:2.3.2]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.11-2.3.2.jar:2.3.2]
        at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.11-2.3.2.jar:2.3.2]
        at scala.Option.map(Option.scala:145) [scala-library-2.11.2.jar:na]
Caused by: org.jongo.marshall.MarshallingException: Unable to unmarshall result to class bdrim.models.User from content { "_id" : { "$oid" : "53beb050d10e5ba896d8d912"} , "email" : "alberto@zero12.it" , "name" : "Alberto" , "surname" : "Simioni" , "password" : "$2a$10$E4hi2giYm4LnYq5e3TrfheGhsjtydWtl3GR/87.tUIA1Xs8MtY9kS" , "company" : { "name" : "Zero12 s.r.l." , "vat" : "04631710284" , "telephoneNumber" : "0499414411" , "country" : "Italy" , "city" : "Carmignano" , "postalCode" : "35010" , "address" : "Via spessa 25/c" , "modules" : [ { "name" : "mailchimp" , "createTime" : { "$date" : "2014-10-15T12:19:12.416Z"} , "expireTime" : { "$date" : "2015-10-15T12:19:12.416Z"} , "options" : { "listid" : "6d7e5ad5b8" , "apikey" : "9fe7bcf4d2ffff92306cfxxxxxacc9ea-us9"}}]} , "role" : "Super Administrator" , "idShop" : "Shop2"}
    at org.jongo.marshall.jackson.JacksonEngine.unmarshall(JacksonEngine.java:45) ~[jongo-1.1.jar:na]
    at org.jongo.ResultHandlerFactory$UnmarshallingResultHandler.map(ResultHandlerFactory.java:43) ~[jongo-1.1.jar:na]
    at org.jongo.FindOne.map(FindOne.java:51) ~[jongo-1.1.jar:na]
    at org.jongo.FindOne.as(FindOne.java:46) ~[jongo-1.1.jar:na]
    at bdrim.models.UsersDao.getUser(UsersDao.java:151) ~[classes/:na]
Caused by: com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class bdrim.models.Company$Module]: can not instantiate from JSON object (need to add/enable type information?)
 at [Source: de.undercouch.bson4jackson.io.LittleEndianInputStream@12adfe45; pos: 361] (through reference chain: bdrim.models.User["company"]->bdrim.models.Company["modules"])
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:164) ~[jackson-databind-2.4.1.jar:2.4.1]
    at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1065) ~[jackson-databind-2.4.1.jar:2.4.1]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:268) ~[jackson-databind-2.4.1.jar:2.4.1]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:124) ~[jackson-databind-2.4.1.jar:2.4.1]
    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:232) ~[jackson-databind-2.4.1.jar:2.4.1]

score 1 · Accepted Answer · answered Oct 15 '14 at 15:17

1

Jackson can't instantiate a Module because it doesn't know how to invoke the Module constructor. You can add a default private empty constructor or add @JsonProperty annotation on each constuctor parameters :

@JsonCreator
public Module(@JsonProperty("name") String name, @JsonProperty("createTime") Date createTime, @JsonProperty("expireTime")Date expireTime, @JsonProperty("options") Map<String, Object> options) {

OR

private Module() {//hidden jackson constructor}

answered Oct 15 '14 at 15:17

Benoît Guérout

1,977
3
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It would be great if you could add all the things that are required, e.g. imports and the containing code for the functions – Patrick Jan 15 '15 at 11:07

MarshallingException when trying to mapping a Class to a document on playframwork

1 Answers1